The Battle of Chacabuco, fought during the Chilean War of Independence, took place on February 12, 1817. The Army of the Andes, from the United Provinces of the Río de la Plata and led by Captain–General José de San Martín, defeated a Spanish force commanded by Rafael Maroto. This victory was a significant defeat for the Captaincy General of Chile, the royalist government established after the division of the Viceroyalty of Peru.